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Natural Climate Patterns

A pool of warm water lurking beneath the surface of the western Pacific has been slowly sloshing eastward in the past few months. This traveling wave of warm water is one of the signs that climate conditions are favorable for the emergence of El Niño later this year.

Atmospheric rivers are the source of 30-50 percent of precipitation along the U.S. West Coast, and they are a major driver of the region's most serious floods. But the events are also called “drought busters” because, as these maps from 2010 show, just one or two storms can help replenish the water system during dry spells.

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It’s finally here! Yesterday, scientists from the National Snow and Ice Data Center announced the ultimate sign of spring: Arctic sea ice reached its winter peak on March 21, 2014, and the annual melt season is underway.